Spock: "Thrusters on full..."?

I sort of get the emotional idea behind it, but why, really, in the last scene at the academy, where Spock's watching Kirk's accolades, does he say "Thrusters on full..." before the final sequence of the Enterprise? Is he remembering his days on the ship, or something? It captures a good emotion of the moment but still doesn't really seem to actually make sense for him to say that there.

It was actually Leonard Nimoy's line (he came up with it, and asked Abrams if he could say a line there when he was initially meant to be silent). Abrams mentions this on the DVD commentary, during the cave scene when Spock Prime meets Kirk. In the commentary it's revealed that he came up with the line while on set, and that it's "his blessing to the future of Star Trek."

Apparently (he said, desperately trying to make the bump of this thread relevant by using new information), given what Pike said in ST09 and what Kirk says in the trailer, Spock Prime should've nodded and said, "Punch it."